package com.zhentao.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {
        //设置kafka的配置信息
        Properties prop = new Properties();
        //链接地址
        prop.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.233.133:9092");
        //key和value的反序列化器
        prop.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        prop.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        //设置消费组
        prop.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
        //手动提交偏移量
        prop.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        //创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(prop);
        //订阅主题
        consumer.subscribe(Collections.singletonList("topic-first"));
        //获取消息
        //同步提交和异步提交偏移量
        try {
            while (true) {
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println("consumerRecord.key：" + consumerRecord.key());
                    System.out.println("consumerRecord.value：" + consumerRecord.value());
                    System.out.println("分区：" + consumerRecord.partition());
                }
                //异步提交
                consumer.commitAsync();

            }

        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误信息：" + e);
        } finally {
            {    //同步偏移量
                consumer.commitSync();
            }
        }

//        while (true){
//            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
//            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
//                System.out.println("consumerRecord.key："+consumerRecord.key());
//                System.out.println("consumerRecord.value："+consumerRecord.value());
//                System.out.println("分区："+consumerRecord.partition());
//                /* try {
//                //同步提交
//                consumer.commitSync();
//            }catch (CommitFailedException e){
//                System.out.println("记录同步提交失败的异常："+e);
//            }*/
//            }
//            //异步的提交偏移量
//           /* consumer.commitAsync(new OffsetCommitCallback() {
//                @Override
//                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
//                    if (e!=null){
//                        System.out.println("记录错误的提交偏移量："+map+"，异常信息为："+e);
//                    }
//                }
//            });*/

//        }

    }
}
